Automatically-locking lock.



A. LEISTLER.

AUTOMATICALLY LOCKING LOCK.

APPLICATION FILED MAR. 9, I9I4.

Patented June 8, 1915.

10 Fig.1.;

THE NORRIS PETERS CO., FHOTC-LITHQ. WASHINGTON, D. C.

" :ALOIS LEISTLEB, or HoLLENs rEIN, Yeas; AUSTBIA-HUNGARY.

AUTOMATICALLY-LOCKING Look. I

A primary object of this invention is to provide an improvedautomatically locking lock for drawers, doors and the like of that heldin its unlocked position, is released tvpe in which the bolt, which isnormally directly or indirectly by means of a blow on an auxiliarymember from the latter. In locks of this type as atpresent knowntheauxiliary member projects from the case of the lock and this hasthedisadvantage that when the drawer or door is open, the bolt may bereleased by accidental contact with the auxiliary member, so that thebolt must be pushed back by means of the key before thedrawer or doorcan be shut. In the improved lock, forming the subject matter of myinvention I obviate this defect by arranging the auxiliary membercompletely inside the lock-case and providing the latter with anaperture through which a stop, provided on the guide of the drawer or onthe frame of the door, enters when the drawer or door is closed andactuates the auxiliary member. This advantage is of importanceparticularly for looks on drawers, because when manipulating with thecontents of the drawer it may readily happen that owing to a portion ofthe contents striking the auxiliary member the bolt is released.

Several embodiments of my lnvention are represented by way of example inthe accompanying drawings, wherein:

Figure 1 is a front elevation of a lock particularly intended fordrawers, the coverplate having been removed and the lock being shown inits unlocked position; the auxiliary member is located inside the caseof the lock and itself holds the bolt in its unlocked position; Fig. 2is a cross section taken on the line A.A in Fig. 1, and Figs. 3 and 1are like views, respectively, of the lock in its locked position; Fig. 5is a view corresponding to Fig. 1, showing a lock differing from thatshown in this figure in that the auxiliary member acts on tumblers; Fig.6 is a horizontal section taken on the line BB in Fig. 5, and Fig. 7 isa like Specification of Letters Patent.

, comprises a ,mally pressed Patented June 8 1915.

Application filedll/Iarch 9, 1914. Serial No. 823,612.

section of the lock in its locked position; Fig. -8 shows a preferredform of the stop; andFig. 9. isa horizontal section showing the lockrepresented in Figs. '1 to 5 .when employed on a door.

Referring firstly to Figs. 1 to 4, this look bolt 1 which can be movedby means of a'key and has a one-step movement. The bolt lies flat on therear wall 2 of the caseof the lock and when moved is guided by a pin 4projecting through a slot 3. "In the locked position the bolt is held bytumblers 5, while it is held in its unlocked position by theauxiliarymember 10. The tumblers which are rotatable about thepivot 6and have a T-shaped recess 7, are held pressed by springs 8 against thestop pin 9 of the bolt. The releasing member or lever 10, disposedadjacent to and parallel with the bolt, ismounted to rock about a pivot11, mounted on the rear wall 2 and is noragainst this wall by a spring12. This lever 10 isformed as a hook which in the unlocked position ofthe bolt 1 takes overa lateral projection 1 of the same and thus holdsthe bolt in this position (Figs. 1 and 2). In proximity to the upper endof the lever 10 the wall 2 is provided in a novel manner with anaperture 13 through which a stop 14, provided on the bottom of the guideof the drawer, can project and coact with the lever 10 when the draweris being closed.- The stop consists of a hook bent rectangularly'preferably stamped out of the materirl of-the sheet-metal plate 15.

When the drawer is being closed the stop 14 projects through theaperture 13 into the case of the lockand forces the lever 10 backagainst the action of the spring 12, whereby the bolt is released andcan fly forward under the action of its spring'16 into the lockedposition represented in Figs. 3 and 4, in which position it is held bythe tumblers 5. On the lock beingunlocked and the drawer pulled forwardthe lever 10, held in its tilted position by the stop 14, is removedfrom the stop and returned into its normal position, tracted bolt withits hook.

In the embodiment shown in Figs. 5 to 7 the bolt 1 is held by tumblersboth in its unlocked and in its locked position; the lowest' or rearmosttumbler 5" (Fig. 5) of the three tumblers holds the bolt in its unlockedposition, while the two upper or front tumblers 5 and 5' hold it in itslocked position.

In order that the tumbler 55 holding the bolt in its unlocked position,may be released by means of the lever 10, the latter is provided notwith a hook, but with a beveled lug 17 which coacts with a projection 18of the tumbler 5".

When the drawer is being closed and the lever 10 is forced back by thestop 14, the tumbler 5" is rocked by the slanting face 1'? of the lever10 and removed from the pin 9 so that the bolt is released and can flyforward "into its locked position. On the drawer bein unlocked andpulled out the lever 10 returns to its normal position, in which itreleases the tumbler 5 so that the latter can move forward into itslocking position and hold the retracted bolt 1.

Obviously, instead of the spring-pressed lever 10 a spring may beprovided, it being formed with a hook in theflock shown in Figs. 1 to 4,and provided with a lateral slanting face 17 for coacting with the tumbler 5 in the lock according to Figs. 5 to 7 With reference to the stop14, thesame is preferably movable so that'it does not hinder a filleddrawer being opened. For this purpose the stop 14 shown in Fig. 8 ismounted to rock between two lugs 15 of the plate 15 in such a mannerthat it is prevented by this plate from rocking backward out of itsoperative position, whereas it can rock freely in the other direction. Aspring 20 tends to hold the stop in its operative position. Shouldthedrawer be pulled forward and the contentsthereof strike against thehook, the latter will be rocked and can enter through an aperture 21 inthe plate 15 into the recess22 in the guide of the drawer. On the drawerbeing closed or after the pressure exerted on the stop 14 is removed,the latter springs back into its operative position.

The above described lock can also be employed for doors, particularlyfor the doors or lids of boxes. For this purpose the lock is mounted insuch manner in the inner side of the door 24 (Fig. 9) that the aperture13 in the wall 2 of the lock is located opposite the stop 14 mounted onthe frame 25 of the door so that-on the door being closed, the stop canenter into the case of the lock and coact with the lever 10. In thisembodiment the stop .14 on the plate 15 for receiving the bolt 1 is apin, and the aperture 13 in the wall 2 extends into the plate 26, inorder to enable the pin to enter into the case of the lock. As theauxiliarymember does not project through the case of the lock in theabove described locks accidental contact with the same and consequentrelease of the bolt is tion a casing, a key-operated locking-bolt, a

spring tending to hold said locking-bolt in its locking position,tumblers coiiperating with said locking bolt,,an auxiliary memberarranged within the casing and adapted to retain the bolt in itsunlocked position, said casing being provided with an aperture, and atrip adapted to enter said aperture upon closing to cause said member torelease said bolt from its unlocked position.

:2. A safety-lock comprising in combination a casing, a key-operatedlocking-bolt, a spring tending to hold said bolt in its lockingposition, tumblers holding the lockingbolt in its unlocked position, anauxiliary member arranged within the casing, said casing being providedwith an aperture, a trip adapted to enter said aperture upon closing tomove said auxiliary member, and a slanting face on the auxiliary memberadapted on movementof the latter to release said tumblers.

3. An automatically locking lock for drawers, doors, or the'like,comprising a casing, a locking-bolt, means within said casing tomaintain said bolt in its retracted position, said casing having anaperture therein in proximity to said means, and a trippingdevice forcausing said means to release said bolt, when said drawer is closed,comprising a pivoted arm adapted to enter the aperture of the casing ofsaid lock to disengage said means from said bolt, a pocket in the casingof said drawer in which said arm is pivoted and into which the arm mayswing when not in the aperture of the casing of the lock, and means foryieldingly maintaining the free end of said arm in its operativeposition outside said pocket.

In testimony whereof I have signed my name to this specification in thepresence of two subscribing witnesses.

ALO'IS LEISTLER.

Witnesses:

ALBIN SCHILLER, Auous'r FUGGER.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents, Washington, I). G.

